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  • Author: Tomasz Nurek x
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Issues of provisions in the Specification of the Essential Terms of Contract (SIWZ) in tenders for realization of forestry works

Abstract

The aim of the work was to analyse the provisions included in the Specifications of the Essential Terms of Contract in tenders for forestry works. The subject of the analysis was tender documentation of a selected Regional Directorate of State Forests. An attention was given to a number of inconsistencies, and non-specific and unjustified requirements. The presence of significant differences in the manner of defining requirements in the examined forest districts was emphasised. In opinion of the authors, the differences observed are unjustified and without any doubt impede the creation of tender documentation by representatives of forestry work companies. The summary of the analysis consists of, among others, a few guidelines on the manner of defining the requirements for forestry work companies and the need to unify the SIWZ provisions at the level of Regional Directorate of State Forests.

Open access
Effect of mechanization level on manpower needs in forestry

Abstract

High work consumption in forest operations is above all the result of the character and task realization mode in works undertaken in forestry. Development of mechanization in forest management activities allows to considerably decrease manpower needs. In the present study, there were analyzed the possibilities of reduction of work consumption by improving the mechanization level of forest works. The method was developed to consider the following assessments: 1) variant W1 - basic option comprising factual work consumption values in works carried out on the area administered by the Regional Directorate of State Forests (RDLP); 2) W2 - showing the effect of 25% upgrade of works to a higher level of mechanization; 3) W3 - showing the effect of 50% upgrade of works to a higher level of mechanization; 4) W4 - comprising analogous calculations to those in variant W1 , but work consumption upgrading was 75%. Simulation calculations revealed considerable differences in needs for labor of different categories of forest workers. On the other hand, with increasing mechanization level, there increase the demands concerning worker qualifications, e.g. a harvester operator must be trained for about 2 years, and the training has to include both simulator exercises (first using software and next - harvester simulator) and field work under supervision to gain sufficient experience. The introduction of higher levels of mechanization into forest operations, and hence considerable reduction of jobs for unqualified workers who are replaced by qualified employees, can help decreasing work consumption in forest operations.

Open access
Variability of energy woodchips and their economic effects

Abstract

The main aim of the work is to assess physical parameters of forest woodchips and their impact on the prices achieved by the supplier in transactions with a power plant. During fragmentation of logging residue, high content of green matter and contaminants negatively impacts the quality parameters that serve as basis for settlements. The analysis concerns data on the main parameters - water content, fuel value, sulphur and ash content - from 252 days of deliveries of forest chips to a power plant. The deliveries were realised from forested areas on an average about 340 km from the plant. Average water content and the resultant fuel value of forest chips was within 27-47% and 8.7-12.9 GJ×Mg-1 (appropriately), respectively. They depend on the month in which they are delivered to the power plant. The threshold values for the above-mentioned parameters are set by the plant at a real level and the suppliers have no problems with meeting them. The parameter that is most frequently exceeded is ash content (11.5% of cases). The settlement system does not differentiate on the basis of the transport distance but gives possibility to lower the settlement price when the quality parameters are not met but provides no reward for deliveries with parameters better than the average ones. On the basis of results obtained, it was calculated that average annual settlement price is lower than the contract price by about 0.20 PLN×GJ-1, which in case of the analysed company may translate into an average daily loss of about 700 PLN.

Open access